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   "source": [
    "# Chapter 1 - Python Basics"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 1.1 Objects\n",
    "### Identifiers\n",
    "\n",
    "- case sensitive\n",
    "\n",
    "- [a-z|A-Z]* _* [0-9]* (cannot begin with numbers[0-9])\n",
    "\n",
    "- associate to an **object** / memory address\n",
    "\n",
    "- similar to: pointer variables in C++ / reference variables in Java\n",
    "\n",
    "e.g.\n",
    "temperature = 98.6 (a floating-point object)\n",
    "\n",
    "33 special **Reserved Words** cannot be used as **Identifiers**"
   ]
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    {
     "output_type": "stream",
     "name": "stdout",
     "text": "98.6\n98.6\n88.6\n98.6\n"
    }
   ],
   "source": [
    "temperature = 98.6\n",
    "original = temperature\n",
    "print(temperature)\n",
    "print(original)\n",
    "temperature = temperature - 10\n",
    "print(temperature)\n",
    "print(original)"
   ]
  },
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   "cell_type": "code",
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   "metadata": {},
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   "source": []
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